Terraform import command crash failures for resources with ids of the form x/y

[ashishth09]

Hi @radeksimko ,

I am writing a resource where I need to compose the id of the resource from two other fields. I recalled k8s resource does something like that for example -

https://github.com/terraform-providers/terraform-provider-kubernetes/blob/master/kubernetes/structures.go#L15-L18

It just clicked me that calls like below would lead to a crash if some one would do -

terraform import resource_kubernetes_config_map.mymap mapname

like someone forgets that actual id is namespace/mapname
https://github.com/terraform-providers/terraform-provider-kubernetes/blob/master/kubernetes/resource_kubernetes_config_map.go#L79

It's all theory in my head at this point. But looks like we should return some meaningful error from the function which decomposes the id into sub-parts, probably something like
func idParts(string) (string, string, error)